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Thanks Rupert my computer has a bad habit of sending duplicates and I dont know why.

Thanks for that link ,somebody else mentioned that valve but they had mistakenly called it a Hempenstal valve. I think thats the answer to the problem Ill try one anyway and perhaps put in a pressure release pipe as well, My problem is ath the shower waste runs past the sink unit en route to the...

Anybody care to offer advice I have only one waste pipe and the wash hand basin feeds on to it as well as the shower, when the wash hand basin is released the waste water comes up through the shower outlet, is there any non return valve of 40MM that could be put on the pipe I Think if I put a...